Astronauts rescued from a mission to mars are kidnapped when they arrive back on earth. They seem to have been irradiated, and can now kill people merely by touching them. But the Doctor discovers the astronauts have been replaced with Alien ambassadors who are being forced to behave in a hostile manner. With The Doctor traveling to the alien mother ship, and Liz kidnapped, The Brigadier is left wondering who to trust.
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The Doctor
Liz Shaw
Brigadier Lethbridge-Stewart
Ralph Cornish
Carrington
Taltalian
John Wakefield
Miss Rutherford
Grey
Collinson
Van Lyden / Alien Ambassador
Quinlan